Abdominal pain, DX with severe gastritis 9/17, on Omeprazole 40mg BID now with bad pain around umbilicus, radiates to pelvis. I eat a few bites of food and have to stop because of pain in abdomen and stomach. Also on magnesium because of the Omeprazole, taking 400 mg, 7 tabs qd. What could this be? Neg. nausea, diarrhea at times but figure it s from magnesium.